/**
 * @author alteredq / http://alteredqualia.com/
 */


import { Pass } from "./Pass";

var RenderPass = function (scene, camera, overrideMaterial, clearColor, clearAlpha) {

	Pass.call(this);

	this.scene = scene;
	this.camera = camera;

	this.overrideMaterial = overrideMaterial;

	this.clearColor = clearColor;
	this.clearAlpha = (clearAlpha !== undefined) ? clearAlpha : 0;

	this.clear = true;
	this.clearDepth = false;
	this.needsSwap = false;

};

RenderPass.prototype = Object.assign(Object.create(Pass.prototype), {

	constructor: RenderPass,

	render: function (renderer, writeBuffer, readBuffer /*, deltaTime, maskActive */) {

		var oldAutoClear = renderer.autoClear;
		renderer.autoClear = false;

		var oldClearColor, oldClearAlpha, oldOverrideMaterial;

		if (this.overrideMaterial !== undefined) {

			oldOverrideMaterial = this.scene.overrideMaterial;

			this.scene.overrideMaterial = this.overrideMaterial;

		}

		if (this.clearColor) {

			oldClearColor = renderer.getClearColor().getHex();
			oldClearAlpha = renderer.getClearAlpha();

			renderer.setClearColor(this.clearColor, this.clearAlpha);

		}

		if (this.clearDepth) {

			renderer.clearDepth();

		}

		renderer.setRenderTarget(this.renderToScreen ? null : readBuffer);

		// TODO: Avoid using autoClear properties, see https://github.com/mrdoob/three.js/pull/15571#issuecomment-465669600
		if (this.clear) renderer.clear(renderer.autoClearColor, renderer.autoClearDepth, renderer.autoClearStencil);
		renderer.render(this.scene, this.camera);

		if (this.clearColor) {

			renderer.setClearColor(oldClearColor, oldClearAlpha);

		}

		if (this.overrideMaterial !== undefined) {

			this.scene.overrideMaterial = oldOverrideMaterial;

		}

		renderer.autoClear = oldAutoClear;

	}

});

export { RenderPass };
